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1. In high-frequency (HF) radio, the capability of a station to make contact, or initiate a circuit, between itself and another specified radio station, without human intervention and usually under processor control.

ALE techniques include automatic signaling, selective calling, and automatic handshaking. Other automatic techniques that are related to ALE are channel scanning and selection, link quality analysis (LQA), polling, sounding, message store-and-forward, address protection, and anti- spoofing .

2. In HF radio, a link control systemFor the Macintosh operating system, which was called System up to version 7. 5, see Mac OS. A system is an assemblage of inter-related elements comprising a unified whole. From the Latin and Greek, the term "system" meant to combine, to set up, to place t that includes automatic scanning, selective calling, sounding, and transmit channel selection using link quality analysis dataA datum is a statement accepted at face value (a "given"). Data is the plural of datum''. A large class of practically important statements are measurements or observations of a variable. Such statements may comprise numbers, words, or images. Etymology T.

Optional ALE functions include polling and the exchange of orderwire commands and messages.